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NEG19RC.20-605 vs NEG21C.20 740 8 of 19 identical Swap Change panels

Trina Solar TSM-NEG19RC.20-605 vs Trina Solar TSM-NEG21C.20 740

Trina Solar TSM-NEG19RC.20-605
TSM-NEG19RC.20-605
605 Wp 22.40 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG21C.20 740
TSM-NEG21C.20 740
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

NEG21C.20 740 leads on the differences that matter

The largest is module efficiency: 1.40 pp more efficient. 8 of 19 comparable parameters are identical.

See all 11 differences
How alike are they
8 of 19 comparable
parameters are identical
identical differs
01

What actually differs

11 of 19 parameters
Parameter NEG19RC.20-605 NEG21C.20 740 Difference
Module efficiency 22.40 % 23.80 % 1.40 pp more efficient
Rated power 605 Wp 740 Wp 135 W more power
Power density 224.0 Wp/m² 238.2 Wp/m² 14.2 Wp/m² higher
Weight 33.7 kg 38.3 kg 4.6 kg lighter
Short-circuit current 15.83 A 18.66 A 2.83 A apart
Module area 2.701 m² 3.106 m² 0.405 m² apart
Weight per kWp 55.7 kg/kWp 51.8 kg/kWp 3.9 kg/kWp lighter
Current at max power 14.94 A 17.58 A 2.64 A apart
Open-circuit voltage 48.70 V 50.30 V 1.60 V apart
Dimensions 2382x1134x30 mm 2384x1303x33 mm 2382x1134x30 mm vs 2384x1303x33 mm
Voltage at max power 40.50 V 42.10 V 1.60 V apart
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
NEG19RC.20-605
20,299 kWh
NEG21C.20 740
24,828 kWh
Lifetime gap
4,529 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NEG19RC.20-605 NEG21C.20 740
Standard test conditions 25 °C 100.0% of rated power 605 W 740 W
Cool, bright day 40 °C 95.7% of rated power 579 W 708 W
Typical summer roof 55 °C 91.3% of rated power 552 W 676 W
Hot roof 70 °C 87.0% of rated power 526 W 643 W
03

Full specification

Parameter NEG19RC.20-605 NEG21C.20 740 Difference
Power and efficiency
Rated power 605 Wp 740 Wp +135 W for NEG21C.20 740
Module efficiency 22.40 % 23.80 % +1.40 pp for NEG21C.20 740
Power density 224.0 Wp/m² 238.2 Wp/m² +14.2 Wp/m² for NEG21C.20 740
Open-circuit voltage 48.70 V 50.30 V 1.60 V apart
Voltage at max power 40.50 V 42.10 V 1.60 V apart
Short-circuit current 15.83 A 18.66 A 2.83 A apart
Current at max power 14.94 A 17.58 A 2.64 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2384x1303x33 mm 2382x1134x30 mm vs 2384x1303x33 mm
Module area 2.701 m² 3.106 m² 0.405 m² apart
Weight 33.7 kg 38.3 kg -4.6 kg for NEG19RC.20-605
Weight per kWp 55.7 kg/kWp 51.8 kg/kWp -3.9 kg/kWp for NEG21C.20 740
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#4,834 vs #462
NEG21C.20 740 leads by 4,372 places
Power density
#4,841 vs #460
NEG21C.20 740 leads by 4,381 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#10,186 vs #5,156
NEG21C.20 740 leads by 5,030 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,783 vs #185
NEG21C.20 740 leads by 3,598 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG19RC.20-605 vs Trina Solar TSM-NEG21C.20Q-760
14 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG19RC.20-605 vs Trina Solar TSM-NEG21C.20Q-755
14 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG19RC.20-605 vs Trina Solar TSM-NEG21C.20Q-750
14 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG19RC.20-605 vs Trina Solar TSM-NEG21C.20Q-745
14 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG19RC.20-605 vs Trina Solar TSM-NEG21C.20-740
11 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG19RC.20-605 vs Trina Solar TSM-NEG21C.20Q-740
14 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG19RC.20-605 or Trina Solar TSM-NEG21C.20 740?
According to our database: Trina Solar TSM-NEG21C.20 740 has higher module efficiency (23.80% vs 22.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG19RC.20-605 and Trina Solar TSM-NEG21C.20 740?
Trina Solar TSM-NEG19RC.20-605 has a module efficiency of 22.40%, while Trina Solar TSM-NEG21C.20 740 is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG19RC.20-605 use vs Trina Solar TSM-NEG21C.20 740?
Trina Solar TSM-NEG19RC.20-605 uses TOPCon cells; Trina Solar TSM-NEG21C.20 740 uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on Trina Solar TSM-NEG19RC.20-605 and Trina Solar TSM-NEG21C.20 740?
Trina Solar TSM-NEG19RC.20-605 has a 30 years power warranty; Trina Solar TSM-NEG21C.20 740 has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are Trina Solar TSM-NEG19RC.20-605 and Trina Solar TSM-NEG21C.20 740 bifacial panels?
Both Trina Solar TSM-NEG19RC.20-605 and Trina Solar TSM-NEG21C.20 740 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.